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PDF BA3170 Data sheet ( Hoja de datos )
| Número de pieza | BA3170 | |
| Descripción | Trickle-charge IC for two-cell/ lithium-ion batteries | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Regulator ICs
Trickle-charge IC for two-cell,
lithium-ion batteries
BA3170
The BA3170 is a trickle-charge IC developed for two-cell, lithium-ion batteries.The IC includes a charge control circuit,
a charge output transistor, and an LED driver for showing the charging status.
FApplications
Lithium-ion (two cell) battery chargers, and charging circuits
FFeatures
1) Output voltage can be varied using an external resis-
tor.
2) The output pin is PNP output with low saturation volt-
age.
3) Built-in output current limiting circuit protects batter-
ies from excessive current, and prevents destruction
of the IC due to output shorts.
The initial charge current is set to a low value (the cur-
rent limit pin voltage can be used to vary the current
limit value).
4) Pulse charging at over 99% of the final voltage.
5) Built-in over-discharge battery return circuit.
6) Built-in charge fault protection circuit.
7) Built-in over-voltage battery operation circuit.
8) Built-in LED output for charge display (two outputs).
9) 12-pin power package provides large power dissipa-
tion in a compact package.
10) Temperature protection circuit prevents thermal de-
struction of the IC.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
395
1 page  
Regulator ICs
FTiming chart
BA3170
FExternal components
Setting the “end point voltage”
Fig.3
Fig.2
Set the “end point voltage” Vbuf using resistors R1 and
R2.
Example:
To set Vbuf to 8.4V:
1.22 = R2 / (R1 ) R2) 8.4
R1 = 5.88 . . . R2
If R2 = 10kΩ, then
R1 = 58.7kΩ
∗ For measurement of the electrical characteristics, Vref and Vbuf are
shorted.
399
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BA3170.PDF ] | |
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